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Document ID (ISN)31293
CIS number 79-690
ISSN - Serial title 0003-4878 - Annals of Occupational Hygiene
Year 1978
Convention or series no.
Author(s) Fletcher B.
Title Effect of flanges on the velocity in front of exhaust ventilation hoods.
Bibliographic information Dec. 1978, Vol.21, No.3, p.265-269. 4 ref.
Abstract Addition of a flange to a local exhaust ventilation hood can produce a large increase in air velocity in front of the hood, An optimum flange width exists - the square root of the slot area - beyond which there is little further increase in exhaust air velocity. The effect of flanges increases in proportion to the aspect ratio of the hood. The addition of even small flanges can have an appreciable effect. Velocity increases exceeding 55% have been measured in front of hoods with an aspect ratio of 16:1.
Descriptors (primary) exhaust hoods; ventilation design; aerodynamics; local exhaust
Descriptors (secondary) experimental determination; design of equipment
Document type -
Subject(s) Dust, aerosols and related diseases
Broad subject area(s)
Browse category(ies) Ventilation